Heat interchanger



y 1 1929- E. B. M CABE ET AL 7 1,720,912

HEAT INTERCHANGER Filed Aug. 1, 1927 Attorneys Patented July 16, 1929.

UNITED STATES PATENT OFFICE.

EDWARD B. MCCABE AND GUY C. CHAMBERLAIN, OE CARBONDALE, P ENNSYLVANIA,

ASSIGNORS T CARBONDALE MACHINE COMPANY, OF CARBONDALE, PENNSYL- VANIA, A CORPORATION OF PENNSYLVANIA.

HEAT INTERCHANGER.

Application filed August 1, 1927. Serial No. 209,714.

This invention relates to heat interchangers of the type in which two fluids are caused to flow in contact with opposite surfaces of adividing wall and preferable in opposite directions, whereby the temperature of one is lowered by the heating of the other.

The invention relates particularly to the type in which there is a bank of parallel tubes supported by tube sheets at opposite 1O ends of a shell or casing.

, One object of the invention is to facilitate the maintenance of tight joints during the expansion and contraction of the parts due to fluctuations through wide ranges in temperature. A further object of the invention is to so support the tube sheets that the heads of the shell may be removed without disturbing the joints at which the tube sheets are connected to the, shell.

As one important feature of the present invention, the bank. of parallel tubes are connected to separate tube sheets, one of which is of such diameter that it may slidelongL tudinally through the shell and be sealed to the shell independent of the securing means for shell heads. A further important feature involves the provision of expansion joints in the shell so ,0 that the length of the shell may vary with changes in the length of the tube and strain on the joint thus obviated.

In the accompanying drawing there is illustrated one embodiment of the invention, and although various features of this preferred embodiment involve important minor features of the invention, yet we do not desire to be limited to the specific construction illustrated as various changes may be made within the scope of the invention as defined in the appended claims.

In the accompanying drawing, the view is a central longitudinal section through a heat interchanger construction in accordance with our invention.

In the construction illustrated, there is provided a shell or tubular casing 10 formed of sheet metal or any other suitable material and having an inlet 11 and an outlet 5 12 vadjacent to opposite ends thereof and preferably at opposite sides. lVithin the shell are a plurality of tubes 13 extending lengthwise thereof through which one fluid form a fluid tight joint at the far end of is to be delivered and out of contact with the fluid which is circulated through the shell. outside of these tubes.

. These tubes are connected to tube sheets 1& and 15 in any'suitable manner so as to form fluid tight joints. The particular man'- ner for connecting the tubes to: the tube sheets is not important as they may be threaded in \place, expanded in the apertures of the tube sheets or provided with gaskets or other sealing means.

As one important feature of the invention, the tube sheet 14 is made of a diameter slightly less than that of the shell so that the tubes connected to this tube sheet may be projected lengthwise through the shell into position.

The shell is provided with an annular collar 16 which has an inwardly extending flange portion provided with a seat 17 Within the shell and with which the tube sheet let may engage. Any suitable sealing means, such for instance as a gasket, may be disposed between the tube sheet and the seat.

At the opposite end of the shell suitable means are provided for forming a fluid tigllit oint between the tube sheet 15 and the s e 1.

As shown the shell has a collar 18 which does not project inwardly beyond the inner surface of the shell so that it does not interfere with movement of the tube sheet 1 L through the collar or flange 18.

collar 16 inside of theseat 17 or may extend through an annular clamping ring 22 seating on the outer side of the collar 16, that is, on the side opposite to the tube sheet 14 so that upon tightening the bolts 21, the inwardly extending flange of the collar 16 may be clamped between the tube sheet 14 and the clamping ring 22.

The shell may be provided with any suit- 1 sheets 14 and 15.

able form of outer heads for delivering head 23 having a. central inlet passage 24:

is clamped to the collar 16 by means-of bolts 25 and thejoint between the head and collar is sealed by a gasket 26.

At'the opposite end there isa' second dome shaped head 27 having an outlet 28 and having a flange which may be secured to the flange 18 by the same bolts 19 that hold the tube sheet 15 in place. head 27 and the tube sheet 15, there is vided a suitable sealing gasket 29-.

As the tubes are fixed to the tube sheets 14 and 15 and as the latter are clamped to the ends of the shell, it will be apparent that a relative expansion of the tubes and shell pro- -would create strain tending to loosen the joints.

To avoid this, there are provided one or more expansion joints .30 which are preferably in the form of annular U-shaped flexible sheet metal sections I having their opposite sides connected to spaced sections of the shell. Two of these joints are shown, one adjacent to the outlet end of the shell and'the other adjacent to the inlet end of the shell, although in some constructions only one such joint need be employed.

The opposite edges of the joint member are preferably welded to the shell so as to form a permanent connection thereto and also the inlet and outlet conduits 11 and 12 are welded to the shell and the collars or flanges 16 and 18 are likewise welded in place.

When it is desired to clean the apparatus, the outer heads 23 and 27 may be removed, if it is necessary to clean only the interior of the tubes. If it is desired to clean the interior of the shell and the exterior of the tubes, the bolts 21 and 19 may be removed and the entire bank of tubes may he slid endwise out of the shell without disturbing the oints between Although our improved heat interchanger may be used for the'treatment of various kinds of fluids, the form illustrated is designed particularly for use in oil refinery practice.

Having thus described our invention, what We claim is new and desire to secure by Letters Patent is: i

1. A heat interchanger, including'a shell having a collar at one end presenting inwardly and outwardly extending flanges, a tube sheet of smaller diameter than said shell and slidable therethrough into engagement with said inwardly extending flange, a'clamping rinflg at the outer side of said last mentioned ange, means for securing together said clamping ring and said tube sheet on opposite sides of said inwardly 'ex- Between the the tubes and the tube tending flange, a-second tube sheet at the opposite end of the shell, and means for detachably securing it to the end of the shell.

2. A heat interchanger including a shell having collars at opposite ends, one having inwardly and outwardly projecting flanges and the other having an outwardly projecting flange, a plurality of tubes within said shell and having tube sheets at opposite ends, one of said tube sheets being adapted to seat against the inner surface ofjsaid 1n- Wardly projecting flange and the other against the outer surface of the outwardly projecting flange of the second mentioned collar, a pair of heads for said shell, one

being detachably secured to the first mentioned collar and the other being detachably secured to the second mentioned tube sheet, means for securing the first mentioned tube sheet to the first mentioned collar, and means for securing the second mentioned tube sheet to the second mentioned collar, whereby said headsmay be removed without disturbing the relationship the tube sheets to the collars, and wher y the tubes and tube sheets may be removed as a unit from the shell.

.3. A heat interchanger including a shell, a plurality of tubes disposed therein, separate tube sheets at the ends ,of said tubes and separate heads at the ends of said shell, said shell at one end having inwardly and outwardly extending flanges with the adjacent tube sheet seating against the inner surface of the inwardly extending flange and the adjacent head being secured to the outwardly extending flange independently of said tube sheet, and said shell at the opposite end having an outwardly extending flange with the adjacent tube sheet seating upon the outer surface thereof and the adjacent head seating .upon the outer surface of said tube sheet, means for securing said last mentioned t'ubesheet to said last mentioned flange, and independent means for securing said last mentioned head.

'4. A heat interchanger including a shell, I

a plurality of tubes disposed therein, tube sheets at opposite ends of said tubes, means for detachabl securing each tube sheet to its correspon 'ng end of the shell to form fluid tight joints, a pair of heads at the outer sides of said tube sheets, and means independent of said first mentioned securing means for detachably securing said heads in position, whereby said heads may be removed without disturbing said fluid m tight joints.

5. A heat interchanger including a shell having-inwardly and outwardly extending flanges at one end thereof, a tube sheet of sma ler diameter than said shell and slidable therethrough into engagement with said inwardly extending flange,

a clampin ring at the outer side of said a last mentioned flange, means for securing together said and a head detachably secured to the outer clamping ring and said tube sheetto clampside of said last mentioned tube sheet. said flange therebetween, a head secured to Signed at Carbondale, in the county of 10 said outwardly extending flange independ- Lackawanna, and State of Penna;, this 25th 5 ent of said tube sheet and said clampin dayof July, 1927.

ring, a tube sheet at the opposite end'of sai EDWARD B. MCGABE. shell and detachably secured to the latter, GUY C. CHAMBERLAIN. 

